CN202378556U - Parabola definition teaching demonstration ruler - Google Patents
Parabola definition teaching demonstration ruler Download PDFInfo
- Publication number
- CN202378556U CN202378556U CN2011204527805U CN201120452780U CN202378556U CN 202378556 U CN202378556 U CN 202378556U CN 2011204527805 U CN2011204527805 U CN 2011204527805U CN 201120452780 U CN201120452780 U CN 201120452780U CN 202378556 U CN202378556 U CN 202378556U
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- CN
- China
- Prior art keywords
- ruler
- parabola
- horizontal
- slide block
- teaching demonstration
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a parabola definition teaching demonstration ruler, which comprises a horizontal straight ruler and is characterized in that: the middle of the horizontal straight ruler is fixedly provided with a vertical straight ruler, and is provided with a dovetail groove; a dovetail slider is arranged in the dovetail groove; the upper end of the vertical straight ruler is connected with a rotating penholder through a rotating shaft; the free end of the rotating penholder is provided with a spring; the end part of the spring is fixedly connected with a chalk sleeve; a chalk is embedded in the chalk sleeve; the lower end of the vertical straight ruler perpendicular to the horizontal straight ruler is provided with a rotating pin; the rotating pin is connected with the dovetail slider through a wire; the chalk sleeve touches the wire; and the length of the wire is equal to the sum of a distance between the rotating pin and the horizontal straight ruler and a distance between the middle point of the horizontal straight ruler and the dovetail slider. The parabola definition teaching demonstration ruler can quickly draw a parabola in a standard way, can improve teaching efficiency and can provide convenience for students to visually understand a parabola definition.
Description
Technical field
The utility model relates to a kind of mathematical education apparatus, specifically a kind of parabola definition teaching demonstration chi.
Background technology
In parabolical definition on the mathematics be: to the distance of a fixed point and set to the equidistant point of a straight line, wherein, described fixed point is parabolic focus on the same plane.In order to let the student understand well, teacher's parabola that will on blackboard, draw.At present teacher's parabolical method of drawing is exactly to adopt ruler usually, and coordinate line draws earlier; With X axle or Y axle as symmetry axis; Parabolic bobbin just is the summit with the intersection point of parabola and symmetry axis, according to parabolical symmetry, and the characteristic point of definition on some points; And then connecting these points successively, parabola promptly draws.This technique of painting speed is slow, influences efficiency of teaching, also influences students understand, and the parabola that draws is also nonstandard.
Summary of the invention
The purpose of the utility model be to provide a kind of can either be fast, the parabola that draws of standard, can improve efficiency of teaching again, be convenient to the parabola definition teaching demonstration chi of understanding the parabola definition of student image.
In order to reach above purpose, the technical scheme that the utility model adopted is: this parabola definition teaching demonstration chi comprises horizontal ruler; It is characterized in that: fix vertical ruler at the middle part of horizontal ruler,, in dovetail groove, be provided with the dovetail slide block laterally being provided with dovetail groove on the ruler perpendicular to horizontal ruler; Vertical ruler upper end perpendicular to horizontal ruler connects rotating penholder through turning cylinder; Free end at rotating penholder is provided with spring, is fixedly connected chalk sleeve in the end of spring, is embedded in chalk at chalk sleeve; Be provided with rotational pin perpendicular to the horizontal lower end of the vertical ruler of ruler; Rotational pin is connected through cotton rope with the dovetail slide block, and chalk sleeve touches cotton rope, the length of cotton rope equal rotational pin to the mid point of the distance of horizontal ruler and horizontal ruler to the dovetail slide block apart from sum.
The utility model is also implemented through following measure: the two ends of described horizontal ruler are provided with sucker.
Described dovetail slide block is provided with the set bolt of cotton rope; Cotton rope passes from the longitudinal hole of dovetail slide block, if the different parabola that draws can be realized through the initial position of adjustment dovetail slide block and the length of cotton rope; After the length adjustment of cotton rope is good, fix with set bolt.
The beneficial effect of the utility model is: with at present in mathematical education, the method for parabola definition teaching compared, can either be fast, the parabola that draws of standard, and can improve efficiency of teaching again, the parabola of understanding that can be convenient to student image defines.
Description of drawings
Fig. 1 is the structure schematic top plan view of the utility model.
Among the figure: 1, horizontal ruler; 2, vertical ruler; 3, dovetail groove; 4, dovetail slide block; 5, turning cylinder; 6, rotating penholder; 7, spring; 8, chalk sleeve; 9, chalk; 10, rotational pin; 11, cotton rope; 12, sucker; 13, set bolt.
The specific embodiment
Make the utility model with reference to Fig. 1.This parabola definition teaching demonstration chi comprises horizontal ruler 1, it is characterized in that: fix the vertical ruler 2 perpendicular to horizontal ruler 1 at the middle part of horizontal ruler 1; Laterally be provided with dovetail groove 3 on the ruler 1; In dovetail groove 3, be provided with dovetail slide block 4, connecting rotating penholder 6 through turning cylinder 5, be provided with spring 7 at the free end of rotating penholder 6 perpendicular to horizontal vertical ruler 2 upper ends of ruler 1; Be fixedly connected chalk sleeve 8 in the end of spring 7; Be embedded in chalk 9 at chalk sleeve 8, be provided with rotational pin 10 perpendicular to the horizontal lower end of the vertical ruler 2 of ruler 1, rotational pin 10 is connected through cotton rope 11 with dovetail slide block 4; Chalk sleeve 8 touches cotton rope 11, the length of cotton rope 11 equal rotational pin 10 to the mid point of the distance of horizontal ruler 1 and horizontal ruler 1 to dovetail slide block 4 apart from sum.When drawing parabola, a hand is arrested dovetail slide block 4 and is slided, and the another hand is arrested chalk sleeve 8 setting-outs simultaneously; When dovetail slide block 4 when an end slides into the other end; Parabola promptly draws, the parabola that draw this moment, and its focus is rotational pin 10; Be parabolical summit perpendicular to the horizontal intersection point of vertical ruler 2 extended lines of ruler 1, on the parabola any point to the distance of rotational pin 10 with all be equal to the length of cotton rope 11 to dovetail slide block 4 apart from sum.
Improvement as the utility model: the two ends of described horizontal ruler 1 are provided with sucker 12, during use, can horizontal ruler 1 be fixed on the blackboard through sucker 12.
Described dovetail slide block 4 is provided with the set bolt 13 of cotton rope 11; Cotton rope 11 passes from the longitudinal hole of dovetail slide block 4; The different parabola if draw; Can realize with the length of cotton rope 11 through the initial position of adjustment dovetail slide block 4, after the length adjustment of cotton rope 11 is good, fix with set bolt 13.
Claims (3)
1. parabola defines the teaching demonstration chi; Comprise horizontal ruler (1); It is characterized in that: the fixing vertical ruler of going up perpendicular to horizontal ruler (1) (2) at the middle part of horizontal ruler (1) laterally being provided with dovetail groove (3) on the ruler (1), is provided with dovetail slide block (4) in dovetail groove (3); Rotating penholder (6) in turning cylinder (5) connection is passed through in vertical ruler (2) upper end perpendicular to horizontal ruler (1); Free end at rotating penholder (6) is provided with spring (7), is fixedly connected in the end of spring (7) and goes up chalk sleeve (8), is embedded in chalk (9) at chalk sleeve (8); Be provided with rotational pin (10) perpendicular to the horizontal lower end of the vertical ruler (2) of ruler (1); Rotational pin (10) is connected through cotton rope (11) with dovetail slide block (4), and chalk sleeve (8) touches cotton rope (11), the length of cotton rope (11) equal rotational pin (10) to the mid point of the distance of horizontal ruler (1) and horizontal ruler (1) to dovetail slide block (4) apart from sum.
2. parabola definition teaching demonstration chi according to claim 1, it is characterized in that: the two ends of described horizontal ruler (1) are provided with sucker (12).
3. parabola definition teaching demonstration chi according to claim 1, it is characterized in that: described dovetail slide block (4) is provided with the set bolt (13) of cotton rope (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204527805U CN202378556U (en) | 2011-11-16 | 2011-11-16 | Parabola definition teaching demonstration ruler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204527805U CN202378556U (en) | 2011-11-16 | 2011-11-16 | Parabola definition teaching demonstration ruler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202378556U true CN202378556U (en) | 2012-08-15 |
Family
ID=46627077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204527805U Expired - Fee Related CN202378556U (en) | 2011-11-16 | 2011-11-16 | Parabola definition teaching demonstration ruler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202378556U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106976340A (en) * | 2017-05-10 | 2017-07-25 | 李若彤 | A kind of para-curve gauge and student's Multi-purpose gauge and its application method |
| CN107038935A (en) * | 2017-04-11 | 2017-08-11 | 冯晟 | A kind of mathematical education parabola apparatus for demonstrating |
-
2011
- 2011-11-16 CN CN2011204527805U patent/CN202378556U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107038935A (en) * | 2017-04-11 | 2017-08-11 | 冯晟 | A kind of mathematical education parabola apparatus for demonstrating |
| CN106976340A (en) * | 2017-05-10 | 2017-07-25 | 李若彤 | A kind of para-curve gauge and student's Multi-purpose gauge and its application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20121116 |